GROOVY-9117: Bump jmh gradle plugin to 0.4.8
GROOVY-9117: Bump jmh gradle plugin to 0.4.8

armsargis/groovy,paulk-asert/incubator-groovy,shils/groovy,armsargis/groovy,shils/groovy,apache/groovy,shils/incubator-groovy,apache/incubator-groovy,paulk-asert/groovy,apache/incubator-groovy,paulk-asert/groovy,armsargis/groovy,paulk-asert/groovy,paulk-asert/incubator-groovy,shils/incubator-groovy,shils/incubator-groovy,apache/groovy,apache/incubator-groovy,apache/groovy,paulk-asert/groovy,shils/incubator-groovy,apache/incubator-groovy,armsargis/groovy,paulk-asert/incubator-groovy,apache/groovy,shils/groovy,paulk-asert/incubator-groovy,shils/groovy,paulk-asert/incubator-groovy